Water cannon



FIG. 1--is a front elevational view of a water cannon showing my new design;

FIG. 2--is a side elevational view thereof;

FIG. 3--is a top view thereof;

FIG. 4--is a rear elevational view;

FIG. 5--is a side elevational view, the side being opposite to that shown in FIG. 2; and,

FIG. 6--is a bottom view thereof. 

I claim the ornamental design for a water cannon, as shown and described. 